Probability Calibration Lab

A local probability-evaluation workbench

Probability Calibration Lab is a free MIT-licensed browser tool for evaluating binary forecasts. Paste probability,outcome CSV, inspect invalid rows, and compare Brier score, clipped log loss, and reliability bins. The chart includes an accessible table and accepted-row CSV export.

The default 16 observations are synthetic demonstrations, not real performance or betting predictions. You can also use your own labeled batches. Computation is local: no dependencies, network requests or persistent storage. No payments, bets, prizes or bookmaker affiliate links.

Interpretation matters

Accuracy at a 0.5 threshold is not a calibration measure. Small samples, class balance, and bin choices limit interpretation. No confidence intervals or significance tests are supplied.

Full source and upstream version on Hugging Face.

Published by Licensed Bets Open Source, part of an affiliate-funded information publisher. The odds-data freshness explanation covers a separate data-quality issue, not evidence validating this synthetic example.

18+ only. Evaluation is not a reason to gamble or a guarantee of profit. Responsible-gambling support resources.

AI assistance was used for code and documentation. Full source and MIT license are included.